If you want to add command window tile to the start screen, here is how you can do this.
- Open the folder c:\windows\system32 in explorer.
- Locate the file cmd.exe
- Right click and select ‘Pin to Start‘

- That’s all. Now click Windows key, you can see a new tile added at the last.
- You can drag and drop this tile wherever you want it to be in the start metro menu.
It looks like this after adding the command window tile.

command windows shortcut in Windows 8 start menu
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An even easier method:
Type cmd while the start page is showing.
Right click on Command Window
Select “Pin to taskbar” on the option charm that will show.
Or select “Pin to Start”